Substantive disazo dyestuff.



- Duchy ofHesse, Germany,

AUGUST LEOPOLD LasKa, or orrnnBaon-on-rnnmnm, GERMANY, Ass'IGNoRTo cnnmscnn rnnnrx enrnsnnm-nnnxraon. or rnanxrom-on-rnn-nsm, GER-- MANY, aconronnrion ,sunsranrrvn nrsazo 'nYEs'rnrF.

To all whom it may concern:

Be it known that 1, A GUST LnoPoLn LASK-A, doctor of philosophy, chemist, a subject of of vOffenbach-on-the-Main, in the Grand with the postoifice address Gerberstrasse 5, have invented new and useful Improvements in Substantive Disazo Dyestuffs, of which the following is aspecification. Q

I have discovered that new I disazo dyestuifs dyeing cotton substantively can be obtained by combining the tetrazo compounds of paradiamins in mineral acid solution with one molecular proportion of 1 :S-annnonaphtholdisulfonic acids, containing the $0 K group not in ortho position to OH and NH and with one molecular proportion of a nitrometa-diamin of the benzene series. The thus obtained dyestuffs dye cotton brown shades which, by subsequent treatment with diazotized para-nitranilin are converted inolive-green ones of great coloring power and fastness to soaping. Among the 1:8- aminonaphtholdisulfonic acids the. 1:8- aminonaphthol-3zfi-disulfonic acid, the 1:8- aminonaphthol-t:6-disulfonic acid and the 1:8-aminonaphthol-3 :5-disulfonic acid are considered.

' The .followingexamples will serve to illus trate the nature of my invention and how it can be carried out; parts being by weight.

Example I: 9.2 parts of benzidin are-dissolved in 300 parts of water and 25 parts of hydrochloric acid 20 B. and diazotized in the usual manner. A solution of 11 .05 parts of l:8aminonaphth'ol-3:6-disulfonic acid (monosodium salt) in 300 parts of water, neutralized by means of sodium carbonate,

is poured into the tetrazo compound. After formation ofthe intermediate product a solution of 8.5 parts of nit-rometaphenylendiamin in 250 parts of water and 20 parts of hydrochloric acid is added and the mixture stirred during 12 hours atth'e' temperature of an ordinary dwelling room. The temperature is then raised to 30 and kept at this point until the formation of dye stuif is completed. The mixture is neutralized by means of sodium carbonate, heated up to 70, and the dyestutt precipitated by addition of common salt. It is in dry state a blackish powder, dissolving in concentrated sulfuric acid with blue, in water with Specification of Letters Patent.

Application filed December 13, 191a Serial no. 597,062.

the German Emperor, and resident brown color. It dyes cotton brown. shades, which by subsequent treatment with diazotized paranitranilin are converted in olive-green ones of greatcoloring power and fastness to soaping.

The formation of dyestulf may be performed in the same manner with 1 :8-a n'iino naphthol-et z6-disulfonic acid I or '1:8-amino.- naphthol-Szti-disulfonic acid, respectively with other nitrometadiamins,

. nitrotoluylendiamin.

Example H: 12.65 parts of meta-meta dichlorobenzidin sulfate (NH :Cl= 1 23) are dissolved'in 500 parts of Water and parts of hydrochloricacid 20 B., filtered if necessary, and diazotized in the usualmanner. A solution of 17.05 parts of 1:8-

aminonaphthol-3 (S-disulfonic acid (monosodium salt) and 1.1 parts of sodium acetate in 200 parts ofwater cooled with ice is poured into the (limo compound; some time afterward a solution of 15 parts of sodium acetate in 100 parts of water is added. After formation of the intermediate product a solution of 8.5 parts of nitro-meta-phenylendiamin in 250 parts of water and 20 parts of hydrochloric acid 20 Be. isadded and the mixture stirred until the formation of dyestuii is completed. The mixture is neutralized by means of sodium carbonate,

heated up to 70, and the dyestufi precipitated by addition of common salt. It is in dry state a blackish powder, soluble 1n concentrated sulfuric acidwi'th violet, in Water for instance Patentedivlar. 28,. 1911 H with brown color. It dyes cotton brownish shades which, by, subsequent treatment with diazotized paranitranilin, are converted in olivegreen ones, being much more yellowish. as the shades obtained from the dyestuff described in Example I. I

If "instead of meta-meta -dichlorobenzidin ortho ortho dichlorobenzidin (NI-1 :01

1 2) is used,-dyestuffs are obtained which in their tinctorial properties come near the dyestuffs describedin Example I.

Now what I claim and desire to secure by Letters Patent is the following:

1. The process for the manufacture of new disazo dyestuffs, consisting in combining the tetrazo compounds of para-diamins in mineral acid solutions with one molecular proportion of 1:8-aminonaphtholsulfonic acids, containing the SO H group not in ortho position to OH andNI-l and with one one molecular proportion of l:8amin0- naphtholdisulfonic acids, containing the SO H group not in ortho position to the OH and NH group, and with one molecular proportion of nitro-metadiamins of the benzene series, which dyestufl's are blackish powders, soluble in concentrated sulfuric acid with blue to violet, in Water with brown color, dyeing cotton brownish shades, which by' subsequent treatment with diazotized para-nitranilin are converted into olivegreenones.

3. The process for the manufacture of a new disa-zo dyestutt, consisting in combining the tetrazo compound of benzidin in mineral acid solution with one molecular pro portion of 1:8 aminonaphthol- 3 :6 disultonic acid and one molecular proportion of nitro-meta-phenylendiamin;

4. As a new article the dyestuft, obtained by combining the tetrazo compound of benzidin in mineral acid solution with one molecular proportion of 1:S-arninonaphthol-QS:6- disulfonic acid and one molecular proportion of nitro-metaphenylenediamin, which dyestufi' is a blackish powder, soluble in concentrated sulfuric acid with blue, in water with brown color, dyeing cotton brown shades, which by subsequent treatment with diazotized para-nitranilin are converted into olive-green ones.

In, testimony, that I claim the foregoing as my invention, 1 have signed by name in presence of two witnesses, this second day of December 1916.

- v AUGUST. LEOPOLD LASKA.

\Vitnesses Hanan it Wm-L, v EMMA MARX. 

